Consider the following statements
In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by Burning,ore fuel is used to increase
1. Thrust
2. The efficiency of engine
3. The range of aircraft
Of these statements

Option (A)

1 and 3 are correct

Option (B)

1 and 2 are correct

Option(C)

2 and 3 are correct

Option(D)

1, 2 and 3 are correct

Correct Option:

(B)

Question Solution:

Turbojet are mainly used in military as fighters, bombers and for transport application. They fly with supersonic speed. For e.g. MIGs, Mirage, Knat, Jaguar etc. the only turbojet used for civil aviation is concord .
Reheating the exhaust gas from the turbine by burning more fuel (Tail pipe burning) raises the exit temperature with result in an increases velocity which increases the thrust and efficiency of engine.